Slot is one of the most preferred gaming game in most casino houses and online gambling platforms but one of it major defector is the fact that players can not give an accurate forecast of the outcome of the game and how the probably fair system works in favor of the house. Apart from dice that it outcome can easily be predicted slot on the other hand is unpredictable.
It's because just as dice, it's a game of luck. Coming from the word itself, forecast, you're just giving possible results but they're not accurate at all.
As result, as you've said it is unpredictable so the house is always having a high chance of winning. There are gamblers that are lucky with this game but in most of the time, it's all about the house.